Boat Crew Flashcards
Define keel
is the backbone of the boat. It runs fore and aft along the center bottom of the boat.
Name three basic hull types
Displacement hull
Planing hull
Semi displacement hull
Name two keel types
Flat plate keel
Bar keel
Beam
The measurement of the widest part of the hull
Length
Distance from the foremost to the after most points on the boats hull, measured in a straight line.
Draft
Depth of the boat from the actual waterline to the bottom of the keel
Free board
Distance from the weather deck to the waterline on a vessel.
How is a hatch made watertight?
A weather deck hatch is made waterline sealing it into a raised framework called a coaming.
State the watertight compartments of each boat type
Hatches, bulkheads, deck
Factors that should be determined before opening watertight doors
You have to determine that a flooding did not occur
If flooded, determine further flooding will not occur
Identify and define Two types of forces that affect stability
Static- placement of weight inside
Dynamic- actions outside the boat (wind, waves)
Name and define the Two principle types of stability
Longitude- tends to balance the boat
Transverse- keeps the boat from rolling over
Equilibrium
When a boat is a at rest, the center of buoyancy acting upward is below the center of gravity acting downward
State the two primary forces that affects a boats stability
Gravity : pushes vessel down in water
Buoyancy : pushes the vessel up to keep it afloat
Buoyancy
Is the upward force of water displaced by the hull; tendency or capacity of a vessel to remain afloat
Define Rolling, Heeling, and Listing
Rolling: side to side motion
Heeling: temporary leaning
Listing: permanent leaning
Center of gravity
The weight of the boat acting vertically downwards
Changes of center of gravity
When weight is added the center of gravity moves toward the added weight. When weight is removed, center of gravity moves in opposite directions
List the general boat design features that influence stability
Size and shape of hull Draft of the boat Trim Displacement Freeboard Superstructure size, weight Non water tight openings
Amidships
The central or middle area of the boat
List prevention and medication for motion sickness
Stay out of confined spaces
Stay above deck in fresh air
Don’t focus on the movement of the boat
Don’t smoke
Medication: anti motion medication
Scopolamine patches
State the main parts of an anchor
Shank
Stock
Flukes
Crown
Bitter end
The running end or free end of a line
Forward
Moving towards the bow